Carbureter.



T. H. THOMPSON 6: F. W. ARKENBERG.

CARBURETER.

APPLICATION HLED AUG. 26, 1915.

1,181,356. Patented May2, 1916.

WITNESS INVENTORS;

z r a y ww @Zd/ WM ATTORNEY UNITED STATES PATENT OFFICE.

THOMAS HENDRIX THOMPSON AND FRED W. ARKENBERG, OF MILAN, INDIANA.

CABBURETER.

Specification of Letters Patent.

Patented May 2, 1916.

Application filed August 26, 1915. Serial No. 47,456.

ing is a specification.

, Our invention relates to carbureters for use with internal combustionengines, and has for its object the provision of a simple and efficientconstruction of this character for effecting maximum carburetion of airpassed therethrough, and for easily and quickly cleaning parts thereof.

'Other objects will appear hereinafter. An exemplification of ourinvention is shown in the accompanying drawing, forming a part of thisspecification, and in which- Figure 1, is a plan view of a carhureterembodying our invention; Fig. 2, is a vertical section of the same; andFig. 3, is a. section taken on line 33 in Fig. 2 with the suctionoperated valve removed.

The preferred form of construction of our invention comprises a fuelchamber having automatic means for maintaining a constant level of fueltherein, and a carhureting chamber in communication with the fuelchamber and provided with manually operable -means for controlling theoperation thereof. The fuel chamber and the means for controlling thesupply of fuel thereto may be of any preferred construction. In the formshown, a fuel chamber 4 is inclosed in a casing or wall 5 having aninlet opening 6 at its bottom and a valve 7 for controlling the passageof fuel through said inlet opening. A valve stem 8 extends upwardly fromthe valve 7 through the chamher 4 and has its upper end slidably mountedin a guide 9 in the top of the casing 5. A hollow float 10 is mounted onthe stem 8 and bears against the under side of a pin 11 which passesthrough the stem to hold the valve closed when the levelof fuel hasreached a predetermined height, and to permit the valve to be open whenthe level of fuel falls below such predetermined height,

Our invention is directed to means for effecting maximum carburetion,the preferred form of which comprises a carburetiiig chamber 12 inclosedin a wall or casing 1.3..and having an air intake opening 14 at?itsbottom and a discharge opening 15 for the carbureted charge at itstop. The opening 14 is covered with a screen covering 16 which isadapted to prevent the admission of dirt and the like to the chamber 12,and a butterfly valve 17 is provided in the lower end of the chamber 12to control the admission of air to the latter. The valve 17 is adaptedprimarily for restricting the passage of air into chamber 12 tofacilitate starting an engine, not shown, to which the carbureter is tobe attached in use.

On the inner wallof casing 13 near the normal height of fuel in chambera is formed a valve seat 18, which is adapted to cooperate with a valve19 slidably mounted on a vertical pin 20 depended from a web 21 formedin the upper portion of the casing 13. Between the web 21 and valve 19on the pin 20 is a compression spring 22 adapted to press lightly on thevalve 19 to facilitate its action and. to prevent it from sticking onthe pin 20.

Provided in the casing or wall- 13 around the chamber 12 and below thevalve seat 18, is an annular reservoir 23 which is supplied with fuelfrom chamber 1 through a passage 24. An annular passage 25 extendsupwardly from the reservoir 23 and terminates in a very narrow annularnozzle 26 in valve seat 18 at a position in the latter to be covered by,the valve 19 when said valve is resting on its seat 18. The nozzlee26 isdis posed slightly higher than the normal fuel level in chamber 4 sothat fuel will not run from the nozzle by gravity, and at a height sothat a vacuum in chamber 12, such as is produced by the running of anengine, not shown, to which the carburcter is attached, will raise valve19 off its seat 18 and draw a very thin sheet of fuel from the nozzle26.

Encircling the passage 25 in the casing 13 is.an annular air chamber 27having an annular orifice 28 'in valve seat 18 concentric with and asclose to the nozzle 26 as possible. The orifice 28 is positioned in thevalve seat 18 so that it will be covered by the valve 19 when the latteris seated. Air is fed'to the chamber 27 through a plurality of passages29 in casing 13. which have their intake openings just inside of thescreen 16. The arrangement is such that when the valve 19 is raised offits seat 18 by the suction of an engine, not shownpa, very thin annularsheet of fuel is drawn from the nozzle 26 and anannularsheetof air drawnagainst each'side of the annular: sheet of fuel, re-

sulting in a very thorough mixture thereof. This construction alsoprovides means which will permit the use of heavy and slow volatilizingfuels. In order to facilitate volatilizing fuel the inner wall of thecasing is cutaway at 30 so that the smallest transverse area in chamber12 is substantially between nozzle 26 and theportion of the vatve 19adaptedto cover the nozzle, cau ing the greatest velocity of the fluidsin the chamber at this point.

The chamber 23, passage 25 and nozzle 26 are preferably formed byrecessingl one of the adjacent walls between the cylindrical bore of thelower portion of casing 13, and a tubular member 31 which is fitted insaid cylindrical bore. The tubular member 31 is provided with aperipheral flange 32 at its lower end, which is held against a shoulder13" on the lower portion of casing 13 by an inwardly extending flange 33formed on a cap member 34. The cap member 34 is threaded on the lowerend of casing-13, and provides means whereby the member 31 may be easilyand quickly removed from its position in the device for cleaning andinspecting the internal fuel passages 23, 24, 25

and 26. Y

The flange 33 of cap member 34 is provided with a plurality ofperforations disposed in a circle around said flange. One of saidperforations 35 is shown in full line,

and one of said perforations is shown in dotted lines in Fig. 2. Theperforations connect the lower portion of chamber 12 with an annularchamber 36 at the bottom of passages 29. With this arrangement, air.

upon entering opening 14 of chamberflQ, is free to pass throughperforations 935% an nular chamber 36, passages 29 and iannula chamber27 to the air nozzle 28.

A projection 37 is formed-on the outei side of the upper portion ofcasing 13, and

provided with "a vertical perforation in which is slidably mounted avalve stem 38.

At the lower end of the valve stem 38 is a valve 39, which cooperateswith a valve seat 40 formed in passage 24. Valve- 39 and its cooperatingseat 40 provide means for controlling the assage of fuel throughpassage: 24. A compression spring 41 is provided around stem 38, andadapted to press up.- wardly on said stem. On the upper-Tend of .thevalve stem is) threaded an adjustible member42, and a lock'nut 43provided at the lower end of member 42 to lock said: member in differentpositions of adjustment. The member 42 is pressed against a cam 44through the influence of spring 41, The cam 44 is fixed on a shaft 45'which passes through the upper portion ofschamber 12, and is actuated bya manually operated lever 46. Tlieshaft 45 also carries a throttle valve417. The arrangement is such that when throttle valve 47 closes opening15 .of

mamas 7 7 chamber 12, the highest point of cam is in contact with themember thereby clos ing, or substantial]iclosing, valve 39. The cam 44is so cut at upon opening throttle valve 47, valve 39 will he openedcorre ingly to feed proper quantity of fuel. fuel nozzle While we haveillu'stmt and descrioed the preferred form of construction of theinvention we do in?" l'esirc tobe 11, ti ed to the precise detailsforth, but desire to avail ourselves of snob variatiqnsfianiil changesas come within the? scope of tlie appended claims. 3-

Vi e claim: 1. A carburets comprising casing in ciosing a carburetingchamber; a valve sxat on the inner wall of the casing in said chamher,there being fuel and air discharge openings spaced apart in the valvethe fuel opening he Yer thin sheet 1 l into the chamber and the airopening: to LAS'IiiZlTQ'Q a sheet of air zinsi one side of the sheet offuel from fue openin and a vaivc in the chamber a. when raised from itsseat. to direct a she t-of '5' gainst the other side of the rel iron:the fuel opening. It carbureter con'zprising a casing in airburetingchain .i'; a valve seat one or wall of the casing around said chamber,there being substantially tweentric annular fuel and air dischargeopenings infthe valveseat, the annular fuel opening being adapted todischarge a very thin tubular coiumn of fuel into said chamber and theannular air opening to discharge a thin annular column of air againstthe outer side.- ofthe column of fuel from the fuel openingyand a valvemounted iii said chem-- ber'gand adapted to direct of air against theinner side of the column of fuel. from the fuel opening- 3. A.carbureter comprisinga casing in closing a carbureting chamber 3- x alveseat on the inner wall of the casingaround said chamber, there beingsubstalntiall v cincem trio annular fuel and air discharge openings inthe valve seatg-the annular-fuel wishing being adapted to disclmrg riawenv tlllli" tubulaircolumn offuel into eiiambr and the anrrrilai' airopenin'gflto disehair ghfiiiwugtiinst J theouter side df 'the column offue from the fuei opening; and a valve emedcmn ssid valve seat in saidchamber andclosing said fuel and air discharge openings, said valvebeing adapted, when unseated, to direct air against the inner side" ofthdifuellifriinfl the -fuei. opening. ise you .vl

:10 the ond I m adapted to discharge a orifice in the valve seat oflarger diameter than and substantially concentric with the fuel nozzle:and a valve normally resting on the val: seat. and closing the airorifice, fuel nozzle and opening in the valve seat.

A carbureter comprising a casing having an annular valveseat on itsinner wall with an opening through the central portion of the valveseat, there being a fuel nozzle in the valve seat substantiallyconcentric with the opening in the latter, and an air orifice in thevalve seat of larger diameter than and substantially concentric with thefuel nozzle; 21 valve resting on the valve seat and closing the airorifice, fuel nozzle and opening in the valve seat; and a springyieldingly holding the valve on the valve seat, the valve being adaptedto open the air orifice, fuel nozzle and opening in the valve seatsimultaneously when unseated from said seat.

6. A carburete comprising a casing having a substai'ilially cylindricalbore in its lower portion and an annular shoulder at the lower end ofsaid cylindrical bore; a tubular member disposed in and slidinglyfitting the eyliud ical bore of the casing; a flange onthe tubularmember engaging said shoulder, there being a fuel nozzle opening;between the tops of the tubular member and said cylindrical bore; and a.cap removably secured to the casing and holding said flange against saidshoulder.

T. A carbiueter comprising a casing hav ing a' substantially cylindricalbore in its lower portion and a shoulder at the lower end of thecvlimlrival bore, there being an annular air orifice substantiallyconcentric with and at the top of said cylindrical bore in the casingwith an air supplying passage leading to the annular orifice; a tubularmember fitted in the cylindrical bore and having a flange thereonresting against said shoulder, there being an annular fuel nozzleopening bemveen the tops of the cylindrical bore and the tubular member,a cap removably secured to the casing and holding the flange againstsaid shoulder; and a valve closing the air orifice, fuel nozzle andopening in the tubular member.

8. A carbureter comprising a casing having a substantially clindricalbore in its lower portion and an annular air orifice sub stantiallyconcentric with and at the top of said cylindrical bore; a tubularmember fitted in the cylindrical bore of the casing and having a flangeresting against the lower portion of the casing, there being an annularfuel nozzle opening between the tops of the tubular member and thecylindrical bore of the casing and substantially concentric with theannular air orifice; and a cap threaded on the casing and engaging theflange locking the tubular member in the casing, there being airpassages through the cap and in the wall of the casing leading from thelower portion of the interior of the casing to said annular air orifice.

9. A carburetor comprising a casing having an annular valve seat on itsinner wall with an opening through the central portion of the valveseat, there being a fuel nozzle in the valve seat substantiallyconcentric with the opening in the latter and an air orifice in thevalve seat of larger diameter than and substantially concentric with thefuel nozzle with air passages leading from the lower portion of thecasing to the air orifice; a valve resiliently held on the valve seatnormally closing the fuel nozzle, air orifice and upper end of theopening in the valve seat; and a valve atthe lower end of the casingcontrolling the flow of air to the opening in the tubular member andsaid air passages simultaneously.

In witness whereof we have signed. our names in the presence of twowitnesses.

THOMAS HENDRIX THOMPSON. FRED W. ARKENBERG. \Yitnesses:

BrNn \VI-nrrmacn, Jas. A. CONNELLY

